Severe Thunderstorm Warning 514, NWS Norman, OK

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
200 PM CDT SUN JUL  4 2004

.DISCUSSION...
WITH MODEST SURFACE CONVERGENCE AND THE APPROACH OF A DRYLINE TO
WEST CENTRAL AND SOUTHWEST OK THIS EVENING, POPS HAVE BEEN TAKEN TO
THE CHANCE CATEGORY ON THE WESTERN BORDER, INCLUDING THE NORTH TX
COUNTIES. OTHERWISE, STORMS GENERATING ON THE CO HIGH PLAINS THIS
AFTERNOON ARE EXPECTED TO DEVELOP INTO AN MCS TONIGHT, FED BY A
FORECAST LLJ ACROSS WESTERN OK INTO SOUTH CENTRAL KS. MOST OF THIS
RAIN SHOULD STAY NORTH OF THE OK BORDER, BUT A GOOD CHANCE FOR RAIN
HAS BEEN INCLUDED IN NORTH CENTRAL PARTS OF OK TONIGHT.

AFTER ANOTHER HOT DAY MONDAY, ESPECIALLY IN THE WEST, MONDAY NIGHT
LOOKS LIKE A BETTER SETUP FOR NORTHERN OK AS A SURFACE BOUNDARY IS
STILL FORECAST TO COME TO NORTHERN OK EARLY TUESDAY AS EASTWARD
PROGRESS OF THE UPPER WAVE LAGS. THIS FRONT SHOULD PUSH INTO OK
BRINGING A BETTER CHANCE TO AT LEAST THE NORTHERN HALF, IF NOT ALL
OF THE STATE BY WEDNESDAY MORNING. AFTER THIS EVENT, MODELS STILL
ATTEMPT TO SHEEPISH BUILD AN UPPER RIDGE OVER THE SOUTHERN PLAINS
BY THE END OF THE WEEK. SO AFTER A MODERATE COOL DOWN ON TUESDAY, A
WARMING TREND SHOULD ENSUE INTO THE WEEKEND WHEN IT LOOKS HOT.

&&

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  72  95  71  88 /  20  20  20  30
HOBART OK         72  96  70  89 /  30  20  20  30
WICHITA FALLS TX  72  97  72  94 /  30  10  20  20
GAGE OK           68  94  67  83 /  40  20  30  30
PONCA CITY OK     73  93  70  84 /  50  30  40  40
DURANT OK         73  94  72  93 /  10  10  10  20

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...NONE.
TX...NONE.

&&

9

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1200 PM CDT SUN JUL 4 2004

OKZ004>048-050>052-TXZ083>090-051200-

THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.

.DAY ONE...TODAY AND TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON
THROUGH TONIGHT ACROSS PORTIONS OF NORTHERN AND WESTERN OKLAHOMA.

LOCATION...
THE SLIGHT RISK AREA IS GENERALLY NORTH AND WEST OF A LINE FROM
STILLWATER TO WEATHERFORD TO HOLLIS.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE FROM LATE THIS
AFTERNOON THROUGH THE OVERNIGHT HOURS.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD BE PREPARED FOR SEVERE WEATHER OPERATIONS FROM LATE
THIS AFTERNOON THROUGH THE OVERNIGHT HOURS.

DISCUSSION...
THUNDERSTORMS THAT MOVED THROUGH PORTIONS OF NORTHERN AND EASTERN
OKLAHOMA THIS MORNING HAVE MOVED OUT OF THE AREA. THESE STORMS HAVE
LEFT AN OUTFLOW BOUNDARY ACROSS CENTRAL AND WEST CENTRAL OKLAHOMA
EARLY SUNDAY AFTERNOON. THIS BOUNDARY IS EXPECTED TO LIFT SLOWLY
NORTH INTO NORTHERN OKLAHOMA OR SOUTHERN KANSAS THIS AFTERNOON AND
EVENING. ALSO A DRYLINE WAS DEVELOPING IN THE CENTRAL TEXAS AND
OKLAHOMA PANHANDLES.

A WARM LAYER OF AIR ABOVE THE SURFACE WILL ACT TO INHIBIT
THUNDERSTORM DEVELOPMENT FOR MUCH OF THE AFTERNOON. HOWEVER AN UPPER
LEVEL DISTURBANCE MOVING THROUGH NEW MEXICO EARLY SUNDAY AFTERNOON
WILL APPROACH THE AREA THIS EVENING... WEAKENING THIS CAP AND
INCREASING THE POSSIBILITY FOR THUNDERSTORM DEVELOPMENT...
ESPECIALLY ALONG THE DRYLINE IN THE CENTRAL OR EASTERN TEXAS AND
OKLAHOMA PANHANDLES... AND ALONG THE OUTFLOW BOUNDARY IN NORTHERN
OKLAHOMA OR SOUTHERN KANSAS. THE ATMOSPHERE WILL BE QUITE
UNSTABLE... AND ANY THUNDERSTORMS THAT DEVELOP WILL BE CAPABLE OF
PRODUCING LARGE HAIL AND DAMAGING WINDS. THERE IS SUFFICIENT WIND
SHEAR TO SUPPORT SUPERCELL THUNDERSTORMS ESPECIALLY NEAR AND NORTH
OF THE OUTFLOW BOUNDARY.

AS THE UPPER LEVEL DISTURBANCE MOVES TOWARD THE AREA OVERNIGHT...
THUNDERSTORMS THAT DEVELOP IN NORTHERN OKLAHOMA AND SOUTHERN KANSAS
MAY DEVELOP INTO A COMPLEX OF THUNDERSTORMS THAT MOVES EAST ACROSS
NORTHERN OKLAHOMA OVERNIGHT. DAMAGING WINDS WILL BE THE PRIMARY
THREAT WITH THESE THUNDERSTORMS ALTHOUGH ISOLATED HAIL WILL ALSO BE
POSSIBLE.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT MONDAY JUL 5.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...50 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...80 PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...

THUNDERSTORM OUTLOOK...
THUNDERSTORMS WILL REMAIN IN THE FORECAST ON MONDAY AND
TUESDAY AS A COLD FRONT APPROACHES THE AREA.  SOME OF THESE
STORMS MAY BE SEVERE...ESPECIALLY ACROSS NORTHERN AND WESTERN
OKLAHOMA.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 7 AM
MONDAY.

.26.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
602 PM CDT SUN JUL 4 2004

OKZ004-042315-
HARPER OK-
602 PM CDT SUN JUL 4 2004

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR HARPER COUNTY.

A STRONG THUNDERSTORM WAS LOCATED 7 MILES SOUTHWEST OF ROSSTON AT 602
PM CDT...MOVING NORTHEAST AT 45 MPH.

SMALL HAIL AND WINDS AROUND 50 MPH ARE POSSIBLE.

PEOPLE IN HARPER COUNTY SHOULD MONITOR THE WEATHER SITUATION CLOSELY.
LISTEN FOR WARNINGS AND REMAIN ALERT FOR THREATENING WEATHER
CONDITIONS.

.SPEG.

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